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SULITLstL/2Sains

Kertas 2Ogos 2012

Nama : Tingkatan : ..............

PROGRAM PENINGKATAN PRESTASI AKADEMIK SPMTAHUN 2A12

SAINS

Kertas 2

Dua jam tiga puluh minit

JANGAN BUKA KERTAS SOATAN INI SEHINGGA DIBERITAHU

1,. Tulis nomo dan tingkotan diruongon yangdisediokan dibohogian otos muka surat ini.

2. Colon dibenorkan menjawob keseluruhon atausebahagion soalan somo oda dolam bahaso Meloyuotau bahasq lnggeris.

3. Jawab semuo soalon dalom Bohagian A danBahogian 8. Bagi Bahagian C, jowab Saolon 7O

don mono-mono satu daripada Soalan 77 otauSoalan 72.

4. Tulis jowapan podo ruangan jawapan yangdisediokan pada kertas soalan. Kertas tulis tambahonsekiranya digunokan, perlu diikot bersomo dengonbuku soolon ini.

5. Langkah mengira hendoklah ditunjukkon.6. Msrkoh bogisetiop ceroian soalan ditunjukkan di

dalom kurungon [ ].7. Rajah tidak dilukis mengikut skala kecuali dinyotokan.8. Penggunaan kolkulotor sointifik yang tidok boleh

di prog romkon od o la h d ibe no rka n,

Untuk KegunaanPemeriksa

Bahaeian SoaIan Markah

A

1

2

3

4

B

5

6

7

8

9

c10

11

l2

Jumlah

Kertas saalan ini mengondungi 27 halomon bercetak

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2

SECTIOil A[ 2O marlesl

Answer all questions.Jauab ttemu,d. soalan

Diagraa 1.1 shows an experiment to study the formation of an image by aplane mirror. An object is placed in front of the plane mirror.Rajah 1..1 memtnjulckan saht eksperimen bagt menglcaji pembenhtlcan imej pa.daermin satatz Satu objek diletakkan di hadapan cermin satah ittt.

InageImej

Diagram 1.1Raiah 1.1

Measure the height of image.Ulotr lcetinggian imej.

......,.., cm

Base on Diagrarn 1.1, state one characteristic of the image formed.Berda,sarkan Rajah 1.7, ngatalcan satu eiriimej Vang terbenfttk.

[1 mcrkJ

(al

tb)

Plane mirror

[1 markl

(cl Diagram 1.2 shows the word seen on a vehicle.Rajah 7 . 2 m.erutnjukkan perkntaan VaW dililwt pada sebuah lcenderaatu

SJHAJIJffFIA

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3

(i) State the word seen by a driver through his front car's mirror.Ngatalcan perlcataan gang ditil&t oleh seorang pemandu melalui erminha.dapanlceretang*

(ii) Base on your answer inl(c)(i), state the characteristic of the image formed.Berda.sarlcan jauapan anda dalam l(c)(t), ngatakan ciri imej Aang terbenfiilc

[2 marlcsl

(d) Mark ({ ) in Table 1 below, t}re device which uses plane mfuror.Tand.akan fll pada Jaduat 1. di bawah alatan gang nanggunakan cermin satalu

PeriscopePerislcop

MicroscopeMikroslap

TelescopeTeleslcop

Table IJadual 1

IL markl

tsrr /2

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4

Didrgram 2 shows an experiment to study the e{fect of yeast on the height ofdough. The height of dough are recorded every 2O minutes for 2 hours.Rajah 2 merutnjukkan suatlt eksperimen'untuk menglcaji kesan' gis ke ata.slcetinggian doh- Ketinggian doh direkodlcan setictp 2A minit selqma 2 jarn.

DougtrDoh

Diagram 2Rajah 2

The result of this experiment is recorded in Table 2.Keptfiusan ekspeimen ini direkodkan dalsm Jadual 2.

Table 2Jadual 2

Tirnes (minute )

Masa (minit )o 20 4A 60 80 100 L20

Height of dough tcm )

Ketinggian doh { cm )2.O 3.6 4.7 4.9 5.0 5.0

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5

{a} {i} Based on Table 2, &aur a gaph of t}re height of dough against time.Berdasarlwn Jadual2 ,Ittkiskan graf ketinggian doh m.elawan masa-

Height of doughcmKetingginn doh/ crrt

(b)

5.O

100

Time/minuteMasa I minit

{2 marlcsl

(ii) Based on the gaph, state the height of dough on the 60th minutes.Berdasarkan graf ngatalcan lcetingginn dohpada minit lce-60.

[1 markl

What is the relationship between the heiglrt of dough in the first 80 minutes ?Apalc.ah habu,ngan di antara lcetinggian doh dan rTrnsa dalam 8O minit pertamn?

LsLrl2

ll marl{

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(c)

6

Predict the height of the dough on the f40th ninutes.Ramallcan lcetinggian doh pada minit Aang l@-140,

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Diagram 3 shows an experiment to determine the calorific value of three typesof food. The foods are completely burnt.Rajah 3 merunjukAcan saht elcspeim.en unfiik rnenenfukan nilai lea,brt bagn tigajenis ma.kanan- MaJcnnan dibalcar dengan lenglcap.

log breadIAg roti l0g groundnut

lAg kacang tanah

Diagram 3Rajah 3

The higlest temperature of water is recorded. The result of the experiment isshown in Table 3.Sl.rtru tertinggi air dieatatknruKeptttusan elcsperim.enitu dihnjulcJcan dalamJadual 3.

I}pe of foodJenis m-alcqrwn

Rise of watertemperature/" C

Kenakan s,*ur air /"CBread

Roti 15Groundrrut

Kacana tanah 23

Table 3Jadual 3

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7

(a) State the variables in tJris e4periment.Ng atakan p em.b olehub ah dalom eksp erim,en ini.

{i) Manipulated variable:P emb ole lntb a.h dimaniptlasi:

lL marlc]

(ii) Constantvariable:Pembolelanb ah dimalarkan:

ll ma"ful

{b} State the hlpothesis for this e:qreriment.Ngatakan hipotesis un/;.tk elcspeimen inL

IL markl

(c) Based on fhis e4periment, state the operational definition for calorific value.Berdasarlcan elcsperimen ind ngatakan d.efintsi seura operasi bagi nilai kalori.

IL rnarkl

(d) Tick {{ the food which has higher calorific value than t}re groundnut.Tandakan (t) ma.kanan yang memrynqai nilai lsalori gang lebih lebih tinggidaipada lcacang tanah .

WatermelonTembikai

Cheese cakeKeklceiu

Cooked ricelYasi

LsLl./2

lL marl4

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8

4 Diagram 4.1 and Diagram 4.2 show an experiment to shrdy the relationshipbetween the mass of an object and inertia. Time taken for both tins to stopswinging is recorded.Rajah 4.1 dan Rajah 4.2 m.enunfulclcan sant elcsperimen mengkaji hubungandiantara jisim objek dengan inersta. Masa gang diambil untuk lcedua4ua tinberlzenti b eragun dicatatkan.

i\

Mass*2OOgJisim * 200g

StopwatchJamrandik

Diagram 4.1Rajah 4.1

Mass=6OOgJisim = 6A09 Jam ranitik

Diagrarn 4.2Rajah 4.2

151,1/2

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9

(a) (t Based on Diagran 4.2, complete Table 4.Berdasarlcan Rajah 4.2, lengleaplcan Jadual 4.

Table 4Jadual 4

(ii) State the observation on the stopwatch reading based onDiagram 4.1 and Diagrarn 4.2.NgataJcan pemerhatian pada bacaan jam randik berdasarleartRajah 4.1 dan Rqiah 4.2

(ur) State the inference that can be made based on the observation ina(a){ii}.Ngatalcan infercns gang dapat dibuat berdasarlcan pemerhntian diab){tl.

[3 marksl

{b} State one responding variable in t}ris experiment.Ng ata.lcan sa&t pembolelubah bergeralcbala.s dalam elrsperimen ini.

{r ma*l

{c) State the operational definition for inertia.Ngatalcan definisi seurra operasi bagi inersia-

{L narkl

Mass of object (g)Jisim obieklal

Timetaken for tin to stop swinging (min)Masatin berlwnti berauun {minl

200 4

600

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10

SE|CTION B[30 marks J

Answer all questionsJanaab semuf, soalan

Diagram 5.1 shows the endocriae gtands.Rajah 5. 1 m.enunjuklcan lcele4jar-leele4iar endokri*


ta) (i) Label X and Y in tl:e boxes provided in Diagram 5.1 using the followinginforrration.Label X dan Y dalam kotak Aang disedialcan d.atam Rajah 5.1 mengganaksnm.aldumat berilfi.tt.

Pituitary GlandKelenjar PittdtariThyroid GlandKelenjwTttpidAdrenal GlandKe(er$ar Adrenal

State one function of Y.Ngatalean saf;.t fungsi Y.

X:

Y:

rstL/2

[3 rnarks]

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(b)

l1

Diagram 5.2 shows a disease caused by excessive hormone in human body.Rajah 5.2 m.errunfukkan perryakit gang disebablun oteh lebilnn harmondalam bad,an manusia.


Name tlre endocrine gland that involved.N amakan kelenj ar endolsin g ang terlibqt.

{il

{c}

{ii} State the disease in Diagram 5.2.Ngatakan pengakit dalam Rajah 5.2.

[2 marks]

Mark 1^/ 1 tfre.foods should be taken by the patient in Diagram 5.2Tandalran (',1 ) makanan Aang patut diambil olehpesakit dalam Rajah 5.2.

PrawnUdang

MeatDaging

CrabKetam

rsLL l2

[l nnrl$

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L2

Diagram 6 shows a schematic diagram of a cross breeding between red roses plantand white roses plant.Rajah 6 manunfuklqn rajah sksma lcaaisn di antara polcok ftiawar merah denganpokokmauar putitl^

Red roses plantPolcoknulwcs merah White roses plant

Polskmautarputih

x

Diagram 6Raiah 6

(a) Name processNamo,lcanproses

ti) P

tii) 012 marksl

(b) Based on Diagram 6, state tlle dominant trait of tJ:e roses ?Berdasarlcan Rajah 6, ngatakan sifat dominan buqa rLo;u)ar tersebft?

Lsl.t /2

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l3

{c} State the genot;pe of offspringNgatalan gercfip bogi anak

(t w:

tii) z:

12 marlcsl

{d} What is the ratio of the number of red rose plants to the number of white roseplants?Bempakah nisbah bilangan anak polcok mawar merah lcepada bilangan anakpolcok m.awar pttih?

ll markl

Diagram 7 shows ttre elements of P, Q, R and Sin an incomplete Periodic Table.Rajah 7 m.erannfulclcan unsur-unsur P,Q,R dan S di dalom Jadual Berlcala Aang tidaklenglwp.

Diagram 7Rajah 7

How ttre elements in the Periodic Table are arranged?Bagaimanalca.h un sur-urrsur di dalam Jadual Berlcala di'sttst m?

(a)

IL ma*l

(b! (t What is the nu:nber of proton in element Q?Berapalrah bilangan proton dalamunxtr Q7

tii)

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Which element has the highest nucleon number?lJnsl,tr VarW mannlcah memryngai rwmbor nukleon gang palirq Wgt?

tsLtl2

ll markl

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t4

tc) Which element represents the transition element?Unsar manalcah m.ewakili ult sur peralihan?

{l markl

{d) Which elements have similar chemical properties?Unsl,tr - unsur gang manakah memtrrunAai sifat kimia gang sama?

lL ma*l

{e) Which element is metal?Unsur VaW m.anakah adalahlogam?

ll markj

8 Diagrarn 8 shows a process to change latex into a suitable nrbber that can be usedto make tyres.Rajah 8 m.enunjulclcan satu proses unfitk menukarlcnn latelcs menjadi getahVang sesuai digurwkanuntuk m.embuat tagar.

P Substance addedBahanP ditambah

LatexsLateks

ta) Na:ne the monomer for latex.N amakan ffr.onomer unhtk late lcs.

Sulphur is added andSulfur ditambah dan

Solid natural rubber Rubber YGetah asti pepejal Heated under high Getah Y

temperatureDipanaskan di bawah*lattinggi

[1 mark]

{b) Nnme substance P.Nqmakan bahnn P.

[1 mark]

{c) (1) Nar'''e rubber Y.Namakan getnh Y.

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15

Draw tlre molecular structure of rubber YLukis stralctur molelatl. bagi getahY.

[2 marl*l

td) State the funcdon of sulphur added to solid natural rubber.Ngatakanfungsi stWr garLg ditambahkepada getah asti pepejal.

{l markl

{e} Mark ({ in the boxes provided the other products which are made fromrubber Y.Tanda {ll pada kotak Aang disedialcan bagi produk lain gang diperbuat daripadagetahY.

Industrial gloveSarung tartgan irdustri

Rubber bandGelang getah

Shoe soleTapak ka"s-ut

ll markl

(ii)

nn[:]

L5L1/2

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t6

Diagfaln 9 shows a schematic diagram of a radio transmission system.Rajah 9 menunjulelcan rajah slcema satu sistem pemnncar radio.

Transmission aerialAqidl peqwtncctr

Diagram 9Rqjah 9

Based on Diagram 9,Berda,sarlsn Raiah 9,

{a) name components R using the following information'nsmalcan lcamporten R menggutufun maJclumat berihfi.

Oscilator ModulatorOsilatar Modulatar

R: ..........

narne the process occurs in component S.namakanproses Uang berlakt dalam lomponen S.

{2 marlcsl

What is the function of a microphone in the radio transmission system?Nyatalcan apatw.hfuttgsi milvofon dalam sistem pemarlcctrr radia t'ersebut?

ll markl

(c) Name the t;pe of wave generated by component R.Namalcan jenis gelombang yang dijannlcan olehlcomponen R-

{i}

(ii)

(b)

L'LL /2

lL mo*l

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L7

{d} What is the main electronic component in an amplifier?Apakah komponen eleldlpnik utama di dalam sebuah amplifier?

lL markl

(e) What type of wave is tranamitted by transmission aerial?Mark ( "J ) your answer in Diagram 9.1.Apalcah jenis gelom.bang gang dipancarlcan oleh aerial pemancar?TandaJcan 1 I j jawapan anda dalam petak gang disedia,lean dalsm Raiah 9.1.

W. n/\/\Diagpm 9.1

Rajah 9.1

lL markl

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18

sEcrlox c{ 2O marl* I

AnswerQaostlon tQ and eith.er Question 11 orQuestlon 12Jautab Sodaa lO dansafltrradaSoalan lL atanSoalaa 12

10 Study the following statement.K aji p erng at aan b e rtfu tt.

Metals show different reactivity when it react with dilute acidI*gam merunnjukkan lceergasan Vqng berbeza apabila bertindalebalas

dengan asid cair

(a) Suggest a hypothesis to investigate the above statement.Cadanglcan safii hipotesis untuk ntengia,sat perngataan di atas.

[1 markl

(b) Using magnesium powder, ?irtc powder, dilute hydrochloric acid and otherapparatus , describe an experiment to test your hypothesis in lO{a} based on thefollowing criteria:

Dengan menggunalean serbuk mngnesium" serbuk zinh a,sid hidroktorikcair dart radas lain, tanrailcan satu elcsperimenundtk menguji hipotesis andadi 1 0 (a) berdasarkan lviteria berilo,tt:

0 Aim of the experimentfi$uan el<,sperim.en {1 rnarkl

(ii) Identification of variablesPengenalpastianpembotelutbah 12 marlcsl

{iii} List of apparatus and materialsSenarai ra.d.as dan balwn [1 rnarkl

(w) Procedure or metltodProsedur atau lcaedah [3 marks]

(v) Tabulation of dataPenjadualan data 11 morkl

(vq ConclusionR.tmusan 11 markl

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19

11 {a} Human activities sometimes cause undesirable effects to t}re environment.State trro human activities and explain their effects to the environment.

. Aktiuiti m.anusia lcol,arlglcala m.endatarqlcan ftr.san buruk terlwdap qlamsekitar.Nyatalwn daa aktiuiti marutsia dan teranglcan lcesannga terh.ad.ap alam sekitar.

$ marltsl

{b} Most factories in an industrial area release smoke and poisonoua gases aswaste product.The waste product produced will cause air pollution.Eaplain methods to overcome this problem.Kebangakan kilang di lwwason perindustian m.embebaslcan a.sap don ga,sberaqrn sebagai bahan buangan-BatfrrL buangan Aang dilwsillcan alcan m.engebablwn penremaranudara .

Taarrylun lcaedoh unfitk mengatasi masalah ini.

Your answer should include the following aspects;Penerartgan artda lendaklah m.engandungi a,spek-a"spek berilatt;

(i) Identi$ the problem Il marklKenal pasti masal"ah

{ii} Clarification of the problem ll marklPe4jelasan masalah

(iii) Suggest four metJrods to solve the problem 14 marlcslCad,anglcan empat lcaedah unfitk meng eles aikan mas alah ini

Lstt/2

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2A

t2 {a} State two dilferences between natural rubber and synthetic rubber.Oive one example of product made from each tlpe of the rubbers.Ngatakan dua perbeman antara getah asli dan getah sintetikBeri safit contoh prodttk gang diperhnt dari setiap jenis getah tersebut.

[a rnarlc$

{b} Diagram 12 shows three types of products made of synthetic rubber.Rojah 12 m.erunjukkan tiga jenis produk gang diperhtat daripada getah sintetik

Soles of shoesTapakkasl,tt

Tyre inner tubeTiub tagar

WetsuitsPakaian m.engelam

Diagram 12Rajah 12

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2'!_

Study tl:e products in Diggram 12 and constnrc! the concept of s5mthetic rubber.Kaji produk-produk dalam Rajah 12 danbina lconsep getah sintetilf-

Your answer should be based on tJre following aspects;Jautapan anda tenda,klah berdasarlcan aspek beilafi;

(i) Identify twc common characteristicsKenal pa,sti dua eiri sepunya

l2 marlcsl

(ii) Give two other products made of synthetic mbberBeri dua mntoh produk lain AaxW diperbuat daipada getah sintetik

12 marlcsl

{fi) Give one non-example of synthetic rubberBeri ssttr bulcan contoh getah sintetik.

[lmark]

(iv) Relate the common characteristic to construct the concept of synthetic rubberHubungkaitkan cii septtngaunhtk mem.bina konsep getah sintetik

ftmark|

pND Or QIttSTIOt{ PAPERKaNTAS SOALAN TAftTAT

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______________________________________________________________________________________Marking Scheme Science SPM Trial Exam 2012

3

MARKING SCHEME ( PAPER 2 )

QuestNo

Marking Criteria Mark ΣMarks

SECTION A1 (a) ………………+ 0.1 cm

Note:Measurement base on question paper

(b) 1. same size/height 2. upright 3. virtual 4. distance of object from the mirror is the same as the distance of image from the mirrorNote: Any one

(c) (i) AMBULANCE

(ii) laterally inverted

(d) periscope

1

1111

1

1

1

1

1

2

1TOTAL 5

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4

QuestNo


2 (a) (i)

Note: 1. All points are transferred correctly – 1m 2. Smooth graph - 1m

(a)(ii) 4.7 + 0.1 (cm ) (Note: Answer base on student’s graph)

(b) 1. As the time increases, the height of dough increases

2. If the time increases, so the height of doughincreases

3. The longer the time, the higher the height ofdough

Any one

(c) 5.0 (cm )

2

1

1

1

2

1

1

1

TOTAL 5

Height of dough/cmKetinggian doh/cm

Time/minuteMasa/min.

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5

QuestNo


3 (a) (i) Manipulated variable: 1. Type of food 2. Bread and groundnutAny one

(ii) Constant variable:1. Mass of food2. Volume of water

Any one

(b) Hypothesis:1. Different types of food have different calorific value2. Groundnut has the higher calorific value/higher rise in temperature3. Bread has the lower calorific value / lower rise in temperature

(c) Define operationally:Calorific value is (the value) shown by the riseof water temperature

(d)

WatermelonTembikai

Cheese cakeKek keju

Cooked riceNasi

√

1

1

1

1

1

2

1

1

1

TOTAL 5

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6

QuestNo


4 (a)(i) 8 min

(ii) Observation:1. Stopwatch reading in Diagram 4.1 is less compared to stopwatch reading in Diagram 4.2 // vice versa2. Time taken in Diagram 4.1 is shorter compared to time taken in Diagram 4.23. Time taken in Diagram 4.1 is 4 minutes and Time taken in Diagram 4.2 is 8 minutes

(iii) Inference:Time taken for tin to stop swinging in Diagram 4.2 islonger because it has higher mass / inertia

(b) Responding variable:1. Inertia of tin 2. time taken for tin to stop swingingAny one

(c) Define operationally:Inertia is shown by the time taken for tins to stopswinging.

1

1

1

1

1

3

1

1

TOTAL 5

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7

5 SECTION B(a) (i) X: pituitary (gland) Y: Adrenal (gland)

(ii) 1. Increases the metabolic rate to overcome pressure 2. Speed up heartbeat and breathingAny one(b) (i) thyroid (gland)

(ii) goiter

(c)

Note: 2 correct – 1 mark

√ √

11

1

1

1

1

3

2

1

TOTAL 6

QuestNo


6 (a) (i) P : meiosis(ii) Q : fertilisation

(b) Red roses

(c) (i) W : Rr(ii) Z : rr

(d) 2:2//1: 1

11

1

11

1

2

1

2

1TOTAL 6

7 (a) According to the number of protons According to the proton numberAny one

(b)(i)11

(ii)T

(c) T

(d) P and S

(e) Q//T

1

1

1

1

1

1

1

2

1

1

1

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8

TOTAL 68 (a) isoprene

(b) ethanoic acid //formic acid// any acid

(c)(i) Vulcanised rubber

(ii)

(d) Sulphur atoms form cross-linkages between rubber polymers/molecules

(e) industrial glove and shoe sole Note: 2 correct - 1 mark

1

1

1

1

1

1

1

1

2

1

1TOTAL 6

QuestNo

Marking Criteria Mark Σ Marks

Cross-linkages

Sulphuratom

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9

9 (a)(i) R : Oscillator(ii) S : Modulation

(b) To change sound wave to audio wave/electric signal

(c) Radio wave

(c) Transistor

(e)

√

11

1

1

1

1

2

1

1

1

1

TOTAL 610 SECTION C

(a) 1. Different metal shows different reactivity with dilute (hydrochloric) acid 2. Magnesium shows higher reactivity with dilute (hydrochloric) acid 3. Zinc shows lower reactivity with dilute (hydrochloric) acid

Any one(b)(i) To study the reactivity of metals with dilute (hydrochloric) acid

(ii) Constant : Type of acid // Concentration/ volume of acid//Mass of metal

Manipulated: Type of metal // magnesium powder and zinc powder Responding : Reactivity of metal // Number of bubbles

(iii) magnesium powder, zinc powder, dilute hydrochloric acid, test tube

1

1

11

1

1

1

1

1

1

1

Max

1

Quest Marking Criteria Mark Σ Marks

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10

No10 (iv)

1 Prepare two test tubes A and B2. Pour dilute hydrochloric acid in test tube A and B // diagram3. Put:(a) Magnesium powder in test tube A// diagram(b) Zinc powder in test tube B // diagram4. Observe the reactivity of the metals with dilute hydrochloric acid (and record in table).

(v)Type of metalJenis logam

Reactivity of metalKereaktifan logam

MagnesiumZinc

(vi) Different metal shows different reactivity withdilute acid

1

1

1

1

3

1

TOTAL 10

Quest Marking Criteria Mark Σ Marks

Magnesiumpowder

DiluteHydrochloricacid

zincpowder

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11

No11(a)

Human activities Effect to environment

1Burning of fossilfuels by vehicles andfactory machinery.

1. Acid rain2. Plant destroy3. Air pollution4. Greenhouse effect5. Global warmingNote : Any one

2

Uncontrolled use ofchemical substance /fertilizer / pesticides/ fungicides inagriculture.

1. Polluted water /lakes / rivers

2. Stimulatesexcessive growth ofalga

3. EutrophicationNote: Any one

3

Disposal of chemicalwaste/ toxicsubstance /radioactive substanceinto waterways

1. Water pollution2. Aquatic life destroy3. Thermal pollutionNote: Any one

4 Use ofchlorofluorocarbon

1. Thinning2. Depletion of ozone

layerNote: Any one

5Disposal of non-biodegradablerubbish and sewage.

1. Landfill sites arefilled with garbage

2. Land pollution3. Contaminated water4. Water pollutionNote: Any one

6 Deforestation

1. Soil erosion2. 2. Flash floods3. 3. Landslides4. Note: Any one

Any two human activities and two effectsNote:1. One human activity – 1 mark2. One correct effect - 1 mark3. Only effect given - 0 mark

2

2

2

2

2

2 4

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12

QuestNo


11(b) Identify of problem: Air pollution

Clarification of problem:Most factories release smoke and poisonous gases.

Methods to solve the problem:1. Using a tall chimney2. Using a filter at the chimney3. Using an electrostatic precipitator / catalytic converter.4. Using air cleaning system5. Law enforcement.

[Any four methods]

1

1

111

11

1

1

4

TOTAL 612(a)

Natural Rubber Synthetic Rubber1 Low heat resistant High heat resistant2 Easily oxidized Cannot be easily

oxidized3 More elastic Less elastic4 Higher ability to absorb sound

Low ability to absorbsound

Any two differencesExamples of each type of the rubber

Natural Rubber Synthetic Rubber1. Aeroplane’s tyre2. Glove

1. Hoses2. Gaskets3. Wetsuits4. Rubber hose of a bunsen buner5. Pharmaceutical

stoppers6. Petrol hoseNote any one

Any one example for each type of rubber

1

1

1

1

11

2

2

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13

QuestNo


12(b) · Common characteristic:1. Resistance to heat2. Low ability to absorb sound3. Low ability to absorb vibration4. Less elasticNote : Any two common characteristics

· Two other products:1. Gaskets2. Electrical insulation3. Rubber hose of the Bunsen burner4. Petrol hose5. Pharmaceutical stoppersNote : Any two relevant answers

· One non-example1. Latex

· Actual ConceptSynthetic rubber is a rubber/substance that isresistance to heat and has low ability to absorb soundNote :1. Use any two characteristics mentioned in 12(b)(i)2. Follow the format of writing actual concept

1111

11111

1

1

2

2

1

1

TOTAL 10

END OF MARKING SCHEME SKEMA PEMARKAHAN TAMAT

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